When a voltaic cell changes to begin operating as an electrolytic cell,

A. the positive electrode changes from being the cathode to being the anode.
B. the negative electrode becomes both the anode and the cathode.
C. the positive electrode changes from being the site of oxidation to being the site of reduction.
D. the negative electrode becomes the site of both oxidation and reduction.

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

How many moles are in 123.0 grams of kclo4?